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CHAPTER 1 INTRODUCING THE RAILS FRAMEWORK
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joy to work with. A large part of Rails s grace owes to Ruby and to the culture and aesthetics that permeate the Ruby community. As you begin to work with the framework, you ll quickly learn that Ruby, like Rails, is rich with idioms and conventions, all of which make for an enjoyable, productive programming environment. In summary, Ruby can be described as follows: An interpreted, object-oriented scripting language Elegant, concise syntax Powerful metaprogramming features Well suited as a host language for creating DSLs Appendix A of this book includes a complete Ruby primer. If you want to get a feel for what Ruby looks like now, go ahead and skip to that appendix and take a look. Don t worry if Ruby seems a little unconventional at first. You ll find it quite readable, even if you re not a programmer. It s safe to follow along in this book learning it as you go, referencing the appendix when you need clarification. If you re looking for a more in-depth guide, Peter Cooper has written a fabulous book titled Beginning Ruby: From Novice to Professional (Apress, 2007). You ll also find the Ruby community more than helpful in your pursuit of the language. Be sure to visit http://ruby-lang.org for a wealth of Ruby-related resources.
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Rails Encourages Agility
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Web applications are not traditionally known for agility. They have a reputation of being difficult to work with and a nightmare to maintain. It is perhaps in response to this diagnosis that Rails came on to the scene, helping to usher in a movement toward agile programming methodologies in web development. Rails advocates and assists in the achievement of the following basic principles when developing software: Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over contract negotiation Responding to change over following a plan So reads the Agile Manifesto1, the result of a discussion between 17 prominent figures (including Dave Thomas, Andy Hunt, and Martin Fowler) in the field of what was then called lightweight methodologies for software development. Today, the Agile Manifesto1 is widely regarded as the canonical definition of agile development.
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1. http://agilemanifesto.org
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CHAPTER 1 INTRODUCING THE RAILS FRAMEWORK
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Rails was designed with agility in mind, and it takes each of the agile principles to heart, almost obsessively. With Rails, you can respond to the needs of customers quickly and easily, and Rails works well during collaborative development. Rails accomplishes this by adhering to its own set of principles, all of which help make agile development possible. Dave Thomas and Andy Hunt s seminal work on the craft of programming, The Pragmatic Programmer (Addison-Wesley, 1999) reads almost like a roadmap for Rails. Rails follows the don t repeat yourself (DRY) principle, the concepts of rapid prototyping, and the you ain t gonna need it (YAGNI) philosophy. Keeping important data in plain text, using convention over configuration, bridging the gap between customer and programmer, and above all, postponing decisions in anticipation of change are institutionalized in Rails. These are some of the reasons that Rails is such an apt tool for agile development, and it s no wonder that one of the earliest supporters of Rails was Dave Thomas himself. In the sections that follow, we re going to take a tour through some of Rails mantras, and in doing so, demonstrate just how well suited Rails is for agile development. While we want to avoid getting too philosophical, some of these points are essential to grasping what makes Rails so important.
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One of the central tenets of Rails philosophy is the notion of less software. What does less software mean It means using convention over configuration, writing less code, and doing away with things that needlessly add to the complexity of a system. In short, less software means less code, less complexity, and fewer bugs.
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